Because you like Will Shakespeare in Shakespeare in Love
Sydney Bristow is a kick-ass double agent on a mission for revenge. See them in Alias.
Kilgrave is a domineering, abusive boyfriend. Then, add in the power of mind control. See them in Marvel Cinematic Universe.
Khan Noonien Singh is super strong, super smart, and out for revenge. He always seems to be two steps ahead of his enemies. See them in Star Trek Into Darkness.
Macbeth was probably named "Most Likely to Kill His Rivals" in his senior yearbook. See them in Macbeth.
On the outside, Gwen seems meek and calm. But she has an inner core of steel. See them in Merlin.
Kesuke Miyagi is a karate expert who thinks the best way a scrawny high schooler can learn how to defend himself is by washing every surface in sight. See them in The Karate Kid.
Working as a captain in the American Expeditionary Forces and a spy for British Intelligence, Steve Trevor wants to end World War I once and for all. See them in DC Extended Universe.
Jesse Aarons' frustration can only find outlet in another world. See them in Bridge to Terabithia.
Though he may be blind, Chirrut Imwe sees the power of the force more than most. See them in Rogue One.
Phoebe Caulfield is a wise-beyond-her-years 10-year-old with an empathetic spirit. See them in The Catcher in the Rye.
Alex Danvers is a brilliant engineer tasked with alien threats, and one of those aliens is her adopted sister Supergirl. See them in Supergirl.
Talking to a stranger on a train is the best decision Jesse Wallace ever made. See them in Before Sunrise.